Low Voltage, 300 MHz Quad 2:1 Mux Analog
HDTV Audio/Video Switch
ADG794
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Bandwidth: 300 MHz
Low insertion loss and on resistance: 5 Ω typical
On-resistance flatness: 0.7 Ω typical
Single 3.3 V/5 V supply operation
Low quiescent supply current: 1 nA typical
Fast switching times
tON, 7 ns
tOFF, 5 ns
TTL/CMOS compatible
ESD protection
2 kV human body model (HBM)
200 V machine model (MM)
1 kV field-induced charged device model (FICDM)
ADG794
S1A
D1
S1B
S2A
D2
S2B
S3A
D3
S3B
S4A
D4
S4B
EN
IN
05150-001
1 OF 2
DECODER
Figure 1.
APPLICATIONS
RGB switches
HDTV
DVD-R
Audio/video switches
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The ADG794 is a monolithic CMOS device comprising four
2:1 multiplexers/demultiplexers with high impedance outputs.
The CMOS process provides low power dissipation yet gives high
switching speed and low on resistance. The on-resistance variation
is less than 1.2 Ω over the input signal range.
1.
Wide bandwidth: 300 MHz.
2.
Ultralow power dissipation.
3.
Crosstalk: −70 dB (typical) at 10 MHz.
4.
Off isolation: −65 dB (typical) at 10 MHz.
The wide bandwidth of the ADG794 (300 MHz typical), coupled
with low distortion (0.18% typical), makes the part suitable for
switching analog audio/video signals.
5.
ESD protection tested as per ESD Association Standards:
The ADG794 operates from a single 3.3 V/5 V supply and is TTL
logic compatible. The switches are controlled by the logic inputs
IN and EN, as shown in Table 4. The EN pin allows the user to
disable all switches.
2 kV HBM (ANSI/ESD STM5.1-2001)
200 V MM (ANSI/ESD STM5.2-1999)
1 kV FICDM (ANSI/ESD STM5.3.1-1999)
These switches conduct equally well in both directions when on.
In the off condition, signal levels up to the supplies are blocked.
The ADG794 switches exhibit break-before-make switching action.
The ADG794 is available in a 16-lead QSOP.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2004–2008 Analog Devices, Inc. All rights reserved.
ADG794
TABLE OF CONTENTS
Features ...................................................................................................1
ESD Caution ......................................................................................5
Applications............................................................................................1
Pin Configuration and Function Descriptions .................................6
Functional Block Diagram ...................................................................1
Terminology...........................................................................................7
General Description ..............................................................................1
Typical Performance Characteristics ..................................................8
Product Highlights ................................................................................1
Typical Application ...............................................................................9
Revision History ....................................................................................2
Test Circuits .........................................................................................10
Specifications..........................................................................................3
Outline Dimensions............................................................................12
Single Supply ......................................................................................3
Ordering Guide ...............................................................................12
Absolute Maximum Ratings.................................................................5
REVISION HISTORY
2/08—Rev A to Rev B
4/06—Rev. 0 to Rev. A
Changes to Absolute Maximum Ratings Section, Table 3 .......... 5
Updated Outline Dimensions ....................................................... 12
Changes to Ordering Guide .......................................................... 12
Changes to Features Section ............................................................1
Changes to Product Highlights Section .........................................1
Changes to Specifications Section...................................................3
Changes to Typical Performance Characteristics .........................8
10/04—Revision 0: Initial Version
Rev. B | Page 2 of 12
ADG794
SPECIFICATIONS
SINGLE SUPPLY
VDD = 5 V ± 10%, GND = 0 V. All specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
ANALOG SWITCH
Analog Signal Range
On Resistance, RON
On-Resistance Match Between Channels, ∆RON
25°C
B Version 1
TMIN to TMAX
0 to 2.5
5
7
0.4
8
1.2
On-Resistance Flatness, RFLAT(ON)
0.7
1.35
LEAKAGE CURRENTS
Source Off Leakage, IS (Off )
Drain Off Leakage, ID (Off )
Channel On Leakage, ID, IS (On)
DIGITAL INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current
IINL or IINH
Digital Input Capacitance, CIN
DYNAMIC CHARACTERISTICS 2
tON, tON (EN)
±0.001
±0.001
±0.001
3
ns typ
ns max
ns typ
ns max
ns typ
ns min
dB typ
dB typ
MHz typ
% typ
pC typ
pF typ
pF typ
pF typ
CL = 35 pF; RL = 50 Ω
VS = 2 V; Figure 11
CL = 35 pF; RL = 50 Ω
VS = 2 V; Figure 11
CL = 35 pF; RL = 50 Ω
VS1 = VS2 = 2 V; Figure 12
f = 10 MHz; RL = 50 Ω; Figure 14
f = 10 MHz; RL = 50 Ω; Figure 15
RL = 50 Ω; Figure 13
RL = 100 Ω
CL = 1 nF; VS = 0 V; Figure 16
−65
−70
300
0.18
7.5
8
14
23
VDD = 5.5 V; digital inputs = 0 V or VDD
0.001
1
2
VS = 3 V/1 V; VD = 1 V/3 V; Figure 9
VS = 3 V/1 V; VD = 1 V/3 V; Figure 9
VD = VS = 3 V/1 V; Figure 10
VIN = VINL or VINH
1
1
nA typ
nA typ
nA typ
VD = 0 V to 1 V; IS = −10 mA
μA typ
μA max
pF typ
8
Off Isolation
Channel-to-Channel Crosstalk
Bandwidth −3 dB
THD + N
Charge Injection
CS (Off )
CD (Off )
CD, CS (On)
POWER REQUIREMENTS
IDD
VD = 0 V to 1 V; IS = −10 mA
VD = 0 V to 1 V; IS = −10 mA; Figure 8
±0.1
3
14
Break-Before-Make Time Delay, tD
V
Ω typ
Ω max
Ω typ
Ω max
Ω typ
Ω max
V min
V max
7
5
Test Conditions/Comments
2.0
0.8
0.001
tOFF, tOFF (EN)
Unit
Temperature range for B version is −40°C to +85°C.
Guaranteed by design, not subject to production test.
Rev. B | Page 3 of 12
μA typ
μA max
ADG794
VDD = 3 V ± 10%, GND = 0 V. All specifications TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
ANALOG SWITCH
Analog Signal Range
On Resistance, RON
On-Resistance Match between Channels, ∆RON
B Version 1
TMIN to TMAX
25°C
0 to 1.5
7
9.5
0.3
11
0.9
On-Resistance Flatness, RFLAT(ON)
2.6
5
LEAKAGE CURRENTS
Source Off Leakage, IS (Off )
Drain Off Leakage, ID (Off )
Channel On Leakage, ID, IS (On)
DIGITAL INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current
IINL or IINH
Digital Input Capacitance, CIN
DYNAMIC CHARACTERISTICS 2
tON, tON (EN)
±0.001
±0.001
±0.001
3
VS = 2 V/1 V; VD = 1 V/2 V; Figure 9
VS = 2 V/1 V; VD = 1 V/2 V; Figure 9
VD = VS = 2 V/1 V; Figure 10
VIN = VINL or VINH
ns typ
ns max
ns typ
ns max
ns typ
ns min
dB typ
dB typ
MHz typ
% typ
pC typ
pF typ
pF typ
pF typ
CL = 35 pF; RL = 50 Ω
VS = 1.5 V; Figure 11
CL = 35 pF; RL = 50 Ω
VS = 1.5 V; Figure 11
CL = 35 pF; RL = 50 Ω
VS1 = VS2 = 1.5 V; Figure 12
f = 10 MHz; RL = 50 Ω; Figure 14
f = 10 MHz; RL = 50 Ω; Figure 15
RL = 50 Ω; Figure 13
RL = 100 Ω
CL = 1 nF; VS = 0 V; Figure 16
−65
−70
300
0.18
4
8
14
23
VDD = 3.3 V; digital inputs = 0 V or VDD
0.001
1
2
VD = 0 V to 1 V; IS = −10 mA
μA typ
μA max
pF typ
1
1
VD = 0 V to 1 V; IS = −10 mA
±0.1
3
10
Off Isolation
Channel-to-Channel Crosstalk
Bandwidth −3 dB
THD + N
Charge Injection
CS (Off )
CD (Off )
CD, CS (On)
POWER REQUIREMENTS
IDD
VD = 0 V to 1 V; IS = −10 mA; Figure 8
V min
V max
16
Break-Before-Make Time Delay, tD
Test Conditions/Comments
2.0
0.8
10
6
V
Ω typ
Ω max
Ω typ
Ω max
Ω typ
Ω max
nA typ
nA typ
nA typ
0.001
tOFF, tOFF (EN)
Unit
Temperature range for B version is −40°C to +85°C.
Guaranteed by design, not subject to production test.
Rev. B | Page 4 of 12
μA typ
μA max
ADG794
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameters
VDD to GND
Analog, Digital Inputs 1
Continuous Current, S or D
Peak Current, S or D
Operating Temperature Range
Industrial (B Version)
Storage Temperature Range
Junction Temperature
QSOP Package, Power Dissipation
θJA Thermal Impedance
Lead Temperature, Soldering
Reflow, Peak Temperature
Time at Peak Temperature
1
Ratings
−0.3 V to +6 V
−0.3 V to VDD + 0.3 V or 30 mA,
whichever occurs first
100 mA
300 mA (pulsed at 1 ms,
10% duty cycle maximum)
−40°C to +85°C
−65°C to +150°C
150°C
566 mW
149.97°C/W
Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. This is a stress rating only;
functional operation of the device at these or any other conditions
above those listed in the operational sections of this specification
is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.
Only one absolute maximum rating may be applied at any one time.
Table 4. Truth Table
260(+0/−5)°C
20 sec to 40 sec
EN
IN
D1
D2
D3
D4
Function
1
0
0
X
0
1
High-Z
S1A
S1B
High-Z
S2A
S2B
High-Z
S3A
S3B
High-Z
S4A
S4B
Disable
IN = 0
IN = 1
ESD CAUTION
Overvoltages at IN, S, or D are clamped by internal diodes. Current should be
limited to the maximum ratings given.
Rev. B | Page 5 of 12
ADG794
IN 1
S1A
16
VDD
15
EN
ADG794
14
S4A
TOP VIEW
(Not to Scale)
13
S4B
2
S1B 3
D1
4
S2A
5
12
D4
S2B
6
11
S3A
D2
7
10
S3B
GND 8
9
D3
05150-002
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 2. Pin Configuration
Table 5. Pin Function Descriptions
Pin N0.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Mnemonic
IN
S1A
S1B
D1
S2A
S2B
D2
GND
D3
S3B
S3A
D4
S4B
S4A
EN
VDD
Description
Logic Control Input. The logic level at this input controls the operation of the multiplexers (see Table 4).
A-Side Source Terminal of Mux1. Can be an input or an output.
B-Side Source Terminal of Mux1. Can be an input or an output.
Drain Terminal of Mux1. Can be an input or an output.
A-Side Source Terminal of Mux2. Can be an input or an output.
B-Side Source Terminal of Mux2. Can be an input or an output.
Drain Terminal of Mux2. Can be an input or an output.
Ground Reference.
Drain Terminal of Mux3. Can be an input or an output.
B-Side Source Terminal of Mux3. Can be an input or an output.
A-Side Source Terminal of Mux3. Can be an input or an output.
Drain Terminal of Mux4. Can be an input or an output.
B-Side Source Terminal of Mux4. Can be an input or an output.
A-Side Source Terminal of Mux4. Can be an input or an output.
Mux Enable Logic Input. Enables or disables the multiplexers (see Table 4).
Positive Power Supply Voltage.
Rev. B | Page 6 of 12
ADG794
TERMINOLOGY
VDD
Most positive power supply potential.
CS (Off)
Off switch source capacitance. Measured with reference to ground.
IDD
Positive supply current.
CD (Off)
Off switch drain capacitance. Measured with reference to ground.
GND
Ground (0 V) reference.
CD, CS (On)
On switch capacitance. Measured with reference to ground.
S
Source terminal. Can be either an input or an output.
CIN
Digital input capacitance.
D
Drain terminal. Can be either an input or an output.
tON
Delay time between the 50% and the 90% points of the digital
input and switch on condition.
IN
Logic control input.
tOFF
Delay time between the 50% and the 90% points of the digital
input and switch off condition.
VD (VS)
Analog voltage on Terminal D and Terminal S.
RON
Ohmic resistance between Terminal D and Terminal S.
tBBM
On or off time measured between the 80% points of both switches
when switching from one to another.
RFLAT (ON)
Flatness is defined as the difference between the maximum and
minimum value of on resistance as measured.
Charge Injection
A measure of the glitch impulse transferred from the digital input
to the analog output during on/off switching.
ΔRON
On-resistance match between any two channels.
Off Isolation
A measure of unwanted signal coupling through an off switch.
IS (Off)
Source leakage current with the switch off.
Crosstalk
A measure of unwanted signal that is coupled through from one
channel to another as a result of parasitic capacitance.
ID (Off)
Drain leakage current with the switch off.
ID, IS (On)
Channel leakage current with the switch on.
VINL
Maximum input voltage for Logic 0.
VINH
Minimum input voltage for Logic 1.
IINL (IINH)
Input current of the digital input.
−3 dB Bandwidth
The frequency at which the output is attenuated by 3 dB.
On Response
The frequency response of the on switch.
Insertion Loss
The loss due to the on resistance of the switch.
THD + N
The ratio of the harmonic amplitudes plus the noise of a signal to
the fundamental.
Rev. B | Page 7 of 12
ADG794
TYPICAL PERFORMANCE CHARACTERISTICS
0
VDD = 5V
RL = 50Ω
TA = 25°C
–1
VDD = 5V
RL = 50Ω
TA = 25°C
ATTENUATION (dB)
OFF ISOLATION (dB)
–2
–30
–50
–70
–3
–4
–5
–6
–7
–8
05150-003
–90
–110
0.1
1
10
100
05150-015
–10
–9
–10
0.1
1000
1
10
FREQUENCY (MHz)
Figure 3. Off Isolation vs. Frequency
Figure 5. Bandwidth
0
–20
1000
100
FREQUENCY (MHz)
4.5
VDD = 5V
RL = 50Ω
TA = 25°C
VDD = 5V
TA = 25°C
NO LOAD CURRENT
4.0
OUTPUT VOLTAGE (V)
–40
–60
–80
3.0
2.5
2.0
1.5
1.0
–100
1
10
100
0
1000
FREQUENCY (MHz)
05150-016
–120
0.1
0.5
05150-004
CROSSTALK (dB)
3.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
INPUT VOLTAGE (V)
Figure 4. Crosstalk vs. Frequency
Figure 6. Output Voltage vs. Input Voltage
Rev. B | Page 8 of 12
4.5
5.0
ADG794
TYPICAL APPLICATION
ADG794
R
R OUTPUT
G
RGB VIDEO
SIGNAL SOURCE
1
G OUTPUT
B OUTPUT
B
AUDIO/SYNC/
OTHER OUTPUT
AUDIO/SYNC/OTHER
SIGNAL SOURCE 1
R
RGB VIDEO
SIGNAL SOURCE G
2
EN
IN
05150-005
B
AUDIO/SYNC/OTHER
SIGNAL SOURCE 2
Figure 7. Audio/Video Switch
Rev. B | Page 9 of 12
ADG794
TEST CIRCUITS
IDS
V1
S
D
ID (OFF)
VS
VD
Figure 8. On Resistance
S
NC
A
D
NC = NO CONNECT
Figure 10. On Leakage
5V
0.1µF
VIN
3V
VDD
50%
VOUT
D
VS
RL
50Ω
IN
CL
35pF
50%
90%
90%
VOUT
tOFF
05150-009
tON
GND
EN
Figure 11. Switching Times
5V
0.1µF
VDD
3V
S1A
D1
S1B
RL
50Ω
VS
CL
35pF
VIN
50%
50%
0V
VOUT
DECODER
80%
tD
EN
tD
GND
05150-010
IN
80%
VS
Figure 12. Break-Before-Make Time Delay
VDD
0.1µF
ADG794
NETWORK
ANALYZER
S1A
50Ω
VS
IN
VIN
D1
EN
GND
VOUT
50Ω
05150-011
VS
VOUT
A
VD
Figure 9. Off Leakage
S
ID (ON)
Figure 13. Bandwidth
Rev. B | Page 10 of 12
05150-008
RON = V1/IDS
A
05150-007
VS
IS (OFF)
D
05150-006
S
ADG794
VDD
0.1µF
ADG794
NETWORK
ANALYZER
S1A
50Ω
50Ω
VS
IN
VIN
VOUT
D1
GND
05150-012
EN
50Ω
Figure 14. Off Isolation
VDD
0.1µF
NETWORK
ANALYZER
ADG794
S1A
50Ω
VS
VOUT
S2A
RL
50Ω
IN
D2
D1
VIN
50Ω
50Ω
GND
05150-013
EN
Figure 15. Channel-to-Channel Crosstalk
5V
VDD
ADG794
VS
S1A
CL
1nF
S1B
S2A
CL
1nF
S2B
S3A
CL
1nF
S3B
S4A
CL
1nF
S4B
D1 VOUT
3V
VEN
D2 VOUT
VOUT
D3 VOUT
ΔVOUT
QINJ = CL × ΔVOUT
D4 VOUT
1 OF 2
DECODER
EN
IN
05150-014
RS
Figure 16. Charge Injection
Rev. B | Page 11 of 12
ADG794
OUTLINE DIMENSIONS
0.197 (5.00)
0.193 (4.90)
0.189 (4.80)
16
9
1
0.158 (4.01)
0.154 (3.91)
0.150 (3.81)
8
0.010 (0.25)
0.006 (0.15)
0.069 (1.75)
0.053 (1.35)
0.065 (1.65)
0.049 (1.25)
0.010 (0.25)
0.004 (0.10)
COPLANARITY
0.004 (0.10)
0.244 (6.20)
0.236 (5.99)
0.228 (5.79)
SEATING
PLANE
0.025 (0.64)
BSC
0.012 (0.30)
0.008 (0.20)
8°
0°
0.050 (1.27)
0.016 (0.41)
0.020 (0.51)
0.010 (0.25)
0.041 (1.04)
REF
012808-A
COMPLIANT TO JEDEC STANDARDS MO-137-AB
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETERS DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 17. 16-Lead Shrink Small Outline Package [QSOP]
(RQ-16)
Dimensions shown in inches and (millimeters)
ORDERING GUIDE
Model
ADG794BRQZ1
ADG794BRQZ-500RL71
ADG794BRQZ-REEL1
ADG794BRQZ-REEL71
1
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
16-Lead Shrink Small Outline Package (QSOP)
16-Lead Shrink Small Outline Package (QSOP)
16-Lead Shrink Small Outline Package (QSOP)
16-Lead Shrink Small Outline Package (QSOP)
Z = RoHS Compliant Part.
©2004–2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05150-0-2/08(B)
Rev. B | Page 12 of 12
Package Option
RQ-16
RQ-16
RQ-16
RQ-16